Analog Devices ADRV9002 User Manual

Preliminary Technical Data UG-1828
Rev. PrC | Page 121 of 338
The total time the ORx is enabled should be at least (tOrxRiseToOn +tpropagationDelay) otherwise no valid data will be received.
Figure 124. ORx Timing with Tx Setup
DIVERSITY MODE
The ADRV9001 supports diversity mode in frequency hopping, however, there are more timing considerations in which the user must
consider.
Primarily, there is increased time required for the ADRV9001 to prepare for an upcoming frame if two channels are enabled. This
increased time must be taken into consideration. This time is currently being characterized and more information will be updated in
future releases.
To enable two channels for diversity, the operation is like a 1T1R use case. However, the user must control the setup signal for both
channels. Prior to the first hop edge, the user must set channel 1 setup rising edge and channel 2 setup rising edge high. There is no
restriction on when these signals come relative to each other, however the last one set should be 1us prior to the hop edge (see frequency
hopping timing overview).
Figure 125. Diversity Timing Example, Rx1/Rx2
FREQUENCY HOPPING WITH RX/ORX GAIN CONTROL
In frequency hopping operation, the user can configure the Rx gain control to either be manual gain control, or AGC.
The user can configure the AGC as in non-FH mode.
When configuring the AGC, the user can either set the AGC to either be reset at the start of each Rx frame to a starting gain index, or to
continue from the previous Rx frame.
AGC Configuration
In the ADRV9001, the AGC configuration has the following field,
resetOnRxOn
If the user desires the AGC to continue from the previous Rx frame, they should set resetOnRxOn to false. If they want the AGC to reset
to a starting gain index each frame, they should set resetOnRxOn to true.
In frequency hopping, if the AGC is configured and the resetOnRxOn field is true, then the starting Rx gain for each frame will be taken
from the frequency hopping table (see Frequency hopping table section) not from the resetOnRxonGainIndex field in the AGC
configuration.
24159-499
DWELL
DWELL
TRANSITION
TRANSITION
DWELL
TRANSITION
Tx
FRAME
Tx FRAME
Tx
FRAME
HOP
Tx SETUP
ORx ENABLE
ORx SETUPORx SETUP
Tx FRAME
ORx
FRAME
ORx ON ORx ON
ORx
FRAME
24159-500
DWELL DWELL
Rx1/2
FRAME
Rx1/2
FRAME
TRANSITION TRANSITION
DWELL
TRANSITION
HOP
Rx1 SETUP
Rx2 SETUP
t
Rx1/2Prepare
t
Rx2RiseToOn
t
Rx1RiseToOn
t
Rx1RiseToOn
t
Rx1/2Prepare
t
Rx2RiseToOn

Analog Devices ADRV9002 Specifications

General

Brand	Analog Devices
Model	ADRV9002
Category	Transceiver
Language	English